CA1262748A - Externally threaded quick connect coupling having integral fluid pressure assisted seal - Google Patents
Externally threaded quick connect coupling having integral fluid pressure assisted sealInfo
- Publication number
- CA1262748A CA1262748A CA000537243A CA537243A CA1262748A CA 1262748 A CA1262748 A CA 1262748A CA 000537243 A CA000537243 A CA 000537243A CA 537243 A CA537243 A CA 537243A CA 1262748 A CA1262748 A CA 1262748A
- Authority
- CA
- Canada
- Prior art keywords
- sleeve
- coupling body
- seal
- coupling
- fluid
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired
Links
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16L—PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
- F16L17/00—Joints with packing adapted to sealing by fluid pressure
- F16L17/02—Joints with packing adapted to sealing by fluid pressure with sealing rings arranged between outer surface of pipe and inner surface of sleeve or socket
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10S285/00—Pipe joints or couplings
- Y10S285/901—Cap closures
Abstract
Abstract of the Disclosure A quick connect coupling (20) for fluid tight connection to a threaded fluid port (22). A body (26) of the quick connect coupling (20) having a cylindrical, externally threaded first end (28) defining an axially extending passage (29) into the coupling body (26).
Axially slidable sleeve (42) being mounted on the out-side of the coupling body (26) for slidable motion bet-ween a seal unassisted position and a seal assisted position, the axially slidable sleeve (42) forcing against an elastomeric seal (30) in the seal assisted position so as to provide a fluid tight seal between an end of the fluid port (22) and the coupling (20).
Axially slidable sleeve (42) being mounted on the out-side of the coupling body (26) for slidable motion bet-ween a seal unassisted position and a seal assisted position, the axially slidable sleeve (42) forcing against an elastomeric seal (30) in the seal assisted position so as to provide a fluid tight seal between an end of the fluid port (22) and the coupling (20).
Description
d 7 '1~
EXTERNALLY THRE:AD~D QUICR CONNECT COUPLING
HAVING INTEGRAL FLUID P~ESSURE: ASSISTED SEAL - - `
AND METHOD OF US ING SAME
Back round of the Invention g ~
The presen~ invention relates to a coupling for use with pressurized fluid systems. More par-ticularly, the present invention relates to an exter-nally threaded quick connect coupling having integral fluid pressure assisted seal.
Current methods for attaching fluid lines and plugging threaded fluid ports generally include a sealing arrangement requiring a wrenching operation to ensure an adequate seal. The sealing arrangement typically involves metal interference of mating parts, sealants, or elastomeric seals. The wrenching operation is required in order to complete the sealing process, or at least prevent the sealing arrangement from being overcome by fluid pressure in the fluid ports. This is time consuming and often cumbersome to accomplish.
Several attempts have been made at developing quick connect couplings utilizing fluid pressure actuated seals. See for example, U.S. Patent Nos.
4,345,783; 4,375,297; 4,527,817; and 4,543,995.
However, these couplings, while enabling a quick connec-tion to occur, are rather cumbersome and have a relati-vely large coupling body making them difficult, if not impossible, to use in difficult to get at areas, or where there is reduced space availability.
Additionally, the above mentioned ~irst three 3~ patents utilize a separate actuating fluid port for delivery of an actuating fluid which adds to their bulkiness and complicated nature. Additionally, the above mentioned fourth ~atent, which utilizes mechnical jaws pressed together in one position and spread apart -in another position, is more complicated than that of .. ..
.. . . . .. .
the present invention. -~
U.S. Patent No~ 3,291,442 discloses a rather -- -complicated gas or vacuum-operated coupling including a~ -~
sleeve and plug slidably mounted on/in the coupling body and which are moved by gas pressure.
The present invention solves these and many other problems associated with currently available coupling devices.
Summary of the Invention The present invention relates to an externally threaded quick connect coupling having an integral fluid pressure assisted seal for fluid tight connection to a t~readed fluid port. The quick connect coupling inclu-des a body having a cylindrical externally threaded first end. The first end defines a passage extending axially into tha body. Elastomeric seal means circum-ferentially surrounds the externally threaded first end for abutting an end of the fluid port upon threading the ~irst end into the fluid port. A sleeve is mounted on the coupling body for axially slidable movement between an unassisted seal position and a pressure assisted seal position. A first end of the sleeve includes shoulder mean~ for engaging the elastomeric seal means in the pressure assisted seal position. An opposite second end of the sleeve abuts against shoulder means oE the coupling body or retaining the sleeve on the coupling body. The axially slidable sleeve and the coupling body cooperate to define a cavity there between. A radially extending passage extends from the axially extending passage to the cavity. The axially slidable sleeve and the coupling body cooperate to cause an unbalanced force on the sleeve when subjected to ~luid pressure, the resultant net force on the sleeve being axially directed in the direction of the fluid port, whereby entrance of . . . .
7~
fluid under pressure from the fluid port into the coupling body causes the sleeve to move forward into engagement with the elastomeric seal means thereby forcing the elastomeric seal means against an end of the fluid port so as to form a fluid tigh-t seal.
Secondary seal means proximate the second end of the sleeve is present for providing a fluid tight seal bet-ween the sleeve and the coupling body.
The present invention does away with the necessity of applying sealants, metal interferences and mechnically assisted wrenching even where very high pressure may be encountered in a fluid system. This is accomplished by providing l'unbalanced" sealing means such that as the system fluid pressure is increased, the sealing ef ect is increased. This is as opposed to a conventional seal arrangement wherein seal arrangements have a tendency to separate as the pressure is increased.
In the present invention, the sleeve and coupling body cooperate to provide the axially slidable sleeve with unequal opposing cross-sectional surface areas transverse to the axis of the coupling which are subjected to the system fluid pressure thereby resulting in a net force being exerted by the fluid pressure on the sleeve in the direction of the fluid port. The sleeve is thus "unbalanced" in a fluid pressure environ-ment in that the axially opposing forces acting on the sleeve are not equal or "balanced". As system fluid pressure is introduced into the connector, the elasto-meric seal of the connector body is forced against theend oE the fluid port by the axially slidable sleeve moving toward the fluid port. This eliminates the need for mechanical wrenching which would be required to pre-vent separation of the connector from the 1uid port.
B
Wear and other damage to the elastomeric seal are mini-mized because rubbing contact and distortion due to wrenchins are eliminated.
The present invention provides a sleeve sli-dably mounted on the coupling body and having a surfacesubjected to the fluid pressure in the passageway of the coupling body which tends to move the sleeve to a pressure assisted seal position. The sleeve and coupling body cooperate such that the sleeve is actuated automatically to the pressure assisted seal position upon introduction of fluid pressure into the coupling.
In the preferred embodiment, as system fluid pressure is introduced into the connector, an end of the axially slidable sleeve is forced against the end of the fluid port so as to provide a mechanical barrier pre-venting extrusion of the elastomeric seal from between the end o~ the fluid port and the sleeve.
The present invention can be utilized with extremely high pressure fluid systems, particularly - 20 viscous fluid system, since it incorporates a threaded end thereby assuring that the connector will not be pulled out of the fluid port as the pressure is increased. The threads provide a mechanical connection which will withstand the extremely high pressures.
The present invention also provides a quick connect coupling which can be hand threaded onto a fluid port or the like and does not require any mechanically assisted wrenching. Accordingly, the present invention provides for a very quick interconnection.
Unlike the first three above mentioned patents, the present invention utilizes the fluid pressure of the system wherein it is being used to pro-vide the pressure assisted sealing function. The above referenced first three patents utilize a separate actuating fluid passageway which increases their ccmplexit~ and enlarges the size o~ the coupling body.
The present invention obtains a very desirable ratio betwesn fluid passageway diameter and overall houslng size enabling it to be utilized in locations where there are severe space constraints.
Additionally, the principles of the present avention may be used in a connector providing for llowthrough of the fluid under pressure as well as in plugs utilized t~ close the end of the fluid port~
Additionally, there are several other numerous applica-tions wherein the principles of the present invention can be applied Another advantage of the present invention is that it provides a fluid line connector with a relati-vely large, straight fluid flow path so as to minimize the ~low restriction and flow turbulence which might otherwise be objectionable.
These and various other advantages and features of novelty which characterize the invention are pointed out with particularity in the claims annexed hereto and ~orming a part hereof. However, for a better understanding of the invention, its advantages, and objects obtained by its use, reference should be mad0 to the drawings which form a further part hereof, and to the accompanying descriptive matter, in which there is illustrated and described a pre~erred embodiment of the invention.
BrieE Description of the Drawings In the drawings, in which like reference numerals and letters indicate corresponding parts throughout the several views;
Figure 1 is a sectional view of an embodiment '7~
of a plug connector utilizing the principles o~ the pre-sent invention, the plug connector being in an unassisted seal state;
Figure 2 is a view similar to that of Figure 1 S with the plug connector being in a pressure assisted seal state;
Figure 3 is a sectional view of an embodiment of a swivel connector in accordance with the principles of the present invention providing or flowthrough of the pressurized fluid, the connector being shown in an unassisted seal state;
Figure 4 is a view similar to that of Figure 3 showing the connector in a pressure assisted seal state;
Figure 5 is a sectional view of an embodiment o an extension coupling in accordance with the prin-ciples of the present invention, the extension coupling being illustrated in an unassisted seal state; and Figure 6 is a sectional view as seen generally along line 6-6 of Figure 2.
Detailed Description of a Preferred Embodiment Illustrated in Figures l and 2 is an embodi-ment of a quick connect coupling 20 in accordance with the principles of the present invention. The quick con~
nect coupling 20 illustrated in Figures l and 2 is being utilized to plug the end of a 1uid port 22 in a pressurized fluid system. It will be appreciated that the present invention might be utilized with any number of different components in a pressurized fluid system and should not be limited to the speciEic embodiments disclosed in this application. For example, the present invention might be used with hydraulic systems, con-tainers, valves, fluid lines, etc. The quick connect 7~
coupling has a body 26 including a cylindrical, exter-nally threaded first end 28 of lesser diameter than a solid first end 27 of the body 26. The externally threaded first end 28 defines a passage 29 extending axially into the body 26. An elastomeric seal 30, such as an O-ring, is positioned in a groove 32 of the coupling body 26 adjacent threads 34 of the threaded first end. Upon threading the coupling body 26 into the fluid port 22 the elastomeric seal 30 will abut an end 40 of the fluid port 22. A reciprocally axially slidable sleeve 42 is slidably mounted on a first cylindrical portion 44 of the coupling body 26 and a greater diameter second cylindrical portion 46 of the coupling body 26 for axially slidable movement between an unassisted seal position as illustrated in Figure l wherein the system pressure is not assisting in for-mation of the seal with the fluid port 26, and a pressure assisted seal position wherein an interior shoulder portion 48 of the sleeve 42 engages the elasto-meric seal 30 and forces the same against the end 40 ofthe fluid port 22 so as to assist in formation of the seal between the quick connect coupling 20 and the fluid port 22 as generally illustrated in Figure 2.
Additionally, in the embodiment shown, a first end 41 of the sleeve 42 is forced against the end 40 of the fluid port 22 so as to cooperate with the end 40 of the fluid port 22 to provide a mechanical barrier preventing extrusion of the seal 30 from between the end 40 of the fluid port 22 and the first end 41 of the sleeve 42.
The sleeve 42 includes an opposite second end 50 cooperating with a shoulder portion 52 of the coupling body 26 for maintaining the sleeve 42 on the coupling body 26. A cavity 54 is defined between the axially slidable sleeve 42 and the coupling body 26. ~ radially extending passage 56 interconnects the axially extending passage 29 to the cavity 54 for delivery of the fluid under pressure as indicated by the arrows 58 from the ~luid port 22 into the cavity 5~. Delivery o~ the fluid under pressure causes the sleeve 42 to move forward into engagement with the elastomeric seal 30. This is due to the fact that an unequal or "unbalancedl' force acting on the sleeve is caused by the sleeve 48 being a greater cross sectional area transverse to the axis of the coupling facing the end 26 of the coupling which is sub-jected to fluid pressure than tha~ ~acing the end 40 of the fluid port 22. In the embodiment shown, and as illustrated in Figu~e 6, this difference in cross sectional surface area is the difference in cross sectional surface area between a bore 47 of the sleeve 42 which slides on the cylindrical portion 46 and a bore 43 of the end 41 of sleeve 42 wherein the elasto-meric seal 30 is positioned. The net ~orce generated is P x dA where P represents fluid pressure and dA repre-sents the difference in cross sectional surface area.
An elastomeric seal 60 is retained in a groove 62 circumferentially about the coupling body 26 between shoulder portions 64 and 66. In systems having extre-mely high operating pressures, a cylindrical backup ring68 might be positioned between the elastomeric seal 60 and the shoulder portion 66 of the coupling body 26.
Under extremely high system fluid pressures, the ring 68 will expand and cooperate with the sleeve 42 to provide a barrier preventing extrusion oE the seal 60 between the sleeve 42 and the coupling body 26. The body 26 and the sleeve 42 might be made of metal. The backup ring 68 might be made of plastic or a Teflon'~ material.
In the specific embodiment oE the quick con-~Z~,''7'~
nect coupling shown, the cavity 54 circumferentially surrounding the coupling is formed by a diagonally extending surface 70 of the sleeve 42 and axially extending and radially extending surfaces 72,74 of the coupling body 26, although it might be formed in any number of different ways.
As illustrated in Figure 2, the fluid under pressure forces the sleeve 42 forward such that it enga-ges and deforms the elastomeric seal 30 and abuts against the end 40 of the fluid port 22.
Illustrated in Figures 3 and 4 is an embodi-ment of a connector in accordance with the principles of the present invention which provides for flowthrough of the fluid under pressure. In this embodiment, parts corresponding to those of the embodiment shown in Figures 1 and 2 are primed. As opposed to a solid end portion 27 of the coupling body 26, the coupling body 26' inGludes an internally threaded fitting 82 mounted in the coupling body 26' for swivel motion relative thereto and for interconnection to a fluid line (not shown) such as a hose or the like. In this embodiment, the coupling body 26' defines first and second bores 84,86 interconnected by a diagonal surface 88. The fitting 82 includes corresponding cylindrical portions 90 and 92 interconnected by a diagonal surface 94 which are configured for reception in the bores 84,86 of the cylindrical body 26'. A retaining ring 96 mounted in a groove 98 of the coupling body 26' engages a shoulder portion lQ0 of the fitting 82 for retaining the fitting 82 in the connector body 26'. An elastomeric seal 102 positioned in a groove 10~ of the fitting 82 between shoulder portions 106 and 108 provides a fluid tight seal between the fitting 82 and the cylindrical body 26'. In the embodiment shown, a backup ring 110 is pre-_9_ sant. The connector is illustrated in Figure 3 in anunassisted seal position, and in Figure 4 in a pressure assisted seal position, the sleeve 42' having been moved forward by the fluid pressure to engage the elastomeric seal 30' and about the end 40' of the fluid port 22'.
Illustrated in Figure 5, is yet another appli--cation o the present invention. In this embodiment, the principles of the present invention are utilized to provide a coupling extension ~aature so as to facilitate access to difficult to reach locations in the pressurized fluid system. In this embodiment, parts corresponding to those of Figures 1 and 2 are doubled primed. In this application, the coupling body 26'' includes a threaded bore portion 120 for receipt of a threaded extension member 122. In this e~bodiment, the extension member 122 might be mechanically wrenched into the coupling body 26'' and suitable sealants supplied to prevent lea~ge between t~e coupling body 26'' and the extension member 122. This embodiment is shown in the unassisted position; however, it will be appreciated that this embodiment functions in a similar fashion to that of the previous embodiments so as to provide a fluid pressure assisted sealing effect.
In use, the coupling body 26 is hand threaded into the fluid port 22 until the end 40 of the Eluid port 22 engages the elastomeric seal 30. As fluid is introduced under pressure into the coupling body 26, illustrated by the arrows 58, the sleeve 42 moves axially toward the elastomeric seal 30 due to the net or unbalanced orce caused by the pressure acting on the sleeve 42. Accordingly, sealing is accomplished without the use of any tools. The coupling can be readily disconnected upon removal of the fluid pressure.
It is to be understood that even though the 7'~3 above numerous characteristics and advantages of the invention have been set forth in the foregoing descrip-tion, together with details of the structure and func-tion of the invention, the disclosure is illustrative only, and changes may be made in detail, especially in matters of shape, size and arrangement of parts within the principles of the invention, to the full extent indicated by the broad, general meaning o the terms in which the appended claims are expressed.
J
EXTERNALLY THRE:AD~D QUICR CONNECT COUPLING
HAVING INTEGRAL FLUID P~ESSURE: ASSISTED SEAL - - `
AND METHOD OF US ING SAME
Back round of the Invention g ~
The presen~ invention relates to a coupling for use with pressurized fluid systems. More par-ticularly, the present invention relates to an exter-nally threaded quick connect coupling having integral fluid pressure assisted seal.
Current methods for attaching fluid lines and plugging threaded fluid ports generally include a sealing arrangement requiring a wrenching operation to ensure an adequate seal. The sealing arrangement typically involves metal interference of mating parts, sealants, or elastomeric seals. The wrenching operation is required in order to complete the sealing process, or at least prevent the sealing arrangement from being overcome by fluid pressure in the fluid ports. This is time consuming and often cumbersome to accomplish.
Several attempts have been made at developing quick connect couplings utilizing fluid pressure actuated seals. See for example, U.S. Patent Nos.
4,345,783; 4,375,297; 4,527,817; and 4,543,995.
However, these couplings, while enabling a quick connec-tion to occur, are rather cumbersome and have a relati-vely large coupling body making them difficult, if not impossible, to use in difficult to get at areas, or where there is reduced space availability.
Additionally, the above mentioned ~irst three 3~ patents utilize a separate actuating fluid port for delivery of an actuating fluid which adds to their bulkiness and complicated nature. Additionally, the above mentioned fourth ~atent, which utilizes mechnical jaws pressed together in one position and spread apart -in another position, is more complicated than that of .. ..
.. . . . .. .
the present invention. -~
U.S. Patent No~ 3,291,442 discloses a rather -- -complicated gas or vacuum-operated coupling including a~ -~
sleeve and plug slidably mounted on/in the coupling body and which are moved by gas pressure.
The present invention solves these and many other problems associated with currently available coupling devices.
Summary of the Invention The present invention relates to an externally threaded quick connect coupling having an integral fluid pressure assisted seal for fluid tight connection to a t~readed fluid port. The quick connect coupling inclu-des a body having a cylindrical externally threaded first end. The first end defines a passage extending axially into tha body. Elastomeric seal means circum-ferentially surrounds the externally threaded first end for abutting an end of the fluid port upon threading the ~irst end into the fluid port. A sleeve is mounted on the coupling body for axially slidable movement between an unassisted seal position and a pressure assisted seal position. A first end of the sleeve includes shoulder mean~ for engaging the elastomeric seal means in the pressure assisted seal position. An opposite second end of the sleeve abuts against shoulder means oE the coupling body or retaining the sleeve on the coupling body. The axially slidable sleeve and the coupling body cooperate to define a cavity there between. A radially extending passage extends from the axially extending passage to the cavity. The axially slidable sleeve and the coupling body cooperate to cause an unbalanced force on the sleeve when subjected to ~luid pressure, the resultant net force on the sleeve being axially directed in the direction of the fluid port, whereby entrance of . . . .
7~
fluid under pressure from the fluid port into the coupling body causes the sleeve to move forward into engagement with the elastomeric seal means thereby forcing the elastomeric seal means against an end of the fluid port so as to form a fluid tigh-t seal.
Secondary seal means proximate the second end of the sleeve is present for providing a fluid tight seal bet-ween the sleeve and the coupling body.
The present invention does away with the necessity of applying sealants, metal interferences and mechnically assisted wrenching even where very high pressure may be encountered in a fluid system. This is accomplished by providing l'unbalanced" sealing means such that as the system fluid pressure is increased, the sealing ef ect is increased. This is as opposed to a conventional seal arrangement wherein seal arrangements have a tendency to separate as the pressure is increased.
In the present invention, the sleeve and coupling body cooperate to provide the axially slidable sleeve with unequal opposing cross-sectional surface areas transverse to the axis of the coupling which are subjected to the system fluid pressure thereby resulting in a net force being exerted by the fluid pressure on the sleeve in the direction of the fluid port. The sleeve is thus "unbalanced" in a fluid pressure environ-ment in that the axially opposing forces acting on the sleeve are not equal or "balanced". As system fluid pressure is introduced into the connector, the elasto-meric seal of the connector body is forced against theend oE the fluid port by the axially slidable sleeve moving toward the fluid port. This eliminates the need for mechanical wrenching which would be required to pre-vent separation of the connector from the 1uid port.
B
Wear and other damage to the elastomeric seal are mini-mized because rubbing contact and distortion due to wrenchins are eliminated.
The present invention provides a sleeve sli-dably mounted on the coupling body and having a surfacesubjected to the fluid pressure in the passageway of the coupling body which tends to move the sleeve to a pressure assisted seal position. The sleeve and coupling body cooperate such that the sleeve is actuated automatically to the pressure assisted seal position upon introduction of fluid pressure into the coupling.
In the preferred embodiment, as system fluid pressure is introduced into the connector, an end of the axially slidable sleeve is forced against the end of the fluid port so as to provide a mechanical barrier pre-venting extrusion of the elastomeric seal from between the end o~ the fluid port and the sleeve.
The present invention can be utilized with extremely high pressure fluid systems, particularly - 20 viscous fluid system, since it incorporates a threaded end thereby assuring that the connector will not be pulled out of the fluid port as the pressure is increased. The threads provide a mechanical connection which will withstand the extremely high pressures.
The present invention also provides a quick connect coupling which can be hand threaded onto a fluid port or the like and does not require any mechanically assisted wrenching. Accordingly, the present invention provides for a very quick interconnection.
Unlike the first three above mentioned patents, the present invention utilizes the fluid pressure of the system wherein it is being used to pro-vide the pressure assisted sealing function. The above referenced first three patents utilize a separate actuating fluid passageway which increases their ccmplexit~ and enlarges the size o~ the coupling body.
The present invention obtains a very desirable ratio betwesn fluid passageway diameter and overall houslng size enabling it to be utilized in locations where there are severe space constraints.
Additionally, the principles of the present avention may be used in a connector providing for llowthrough of the fluid under pressure as well as in plugs utilized t~ close the end of the fluid port~
Additionally, there are several other numerous applica-tions wherein the principles of the present invention can be applied Another advantage of the present invention is that it provides a fluid line connector with a relati-vely large, straight fluid flow path so as to minimize the ~low restriction and flow turbulence which might otherwise be objectionable.
These and various other advantages and features of novelty which characterize the invention are pointed out with particularity in the claims annexed hereto and ~orming a part hereof. However, for a better understanding of the invention, its advantages, and objects obtained by its use, reference should be mad0 to the drawings which form a further part hereof, and to the accompanying descriptive matter, in which there is illustrated and described a pre~erred embodiment of the invention.
BrieE Description of the Drawings In the drawings, in which like reference numerals and letters indicate corresponding parts throughout the several views;
Figure 1 is a sectional view of an embodiment '7~
of a plug connector utilizing the principles o~ the pre-sent invention, the plug connector being in an unassisted seal state;
Figure 2 is a view similar to that of Figure 1 S with the plug connector being in a pressure assisted seal state;
Figure 3 is a sectional view of an embodiment of a swivel connector in accordance with the principles of the present invention providing or flowthrough of the pressurized fluid, the connector being shown in an unassisted seal state;
Figure 4 is a view similar to that of Figure 3 showing the connector in a pressure assisted seal state;
Figure 5 is a sectional view of an embodiment o an extension coupling in accordance with the prin-ciples of the present invention, the extension coupling being illustrated in an unassisted seal state; and Figure 6 is a sectional view as seen generally along line 6-6 of Figure 2.
Detailed Description of a Preferred Embodiment Illustrated in Figures l and 2 is an embodi-ment of a quick connect coupling 20 in accordance with the principles of the present invention. The quick con~
nect coupling 20 illustrated in Figures l and 2 is being utilized to plug the end of a 1uid port 22 in a pressurized fluid system. It will be appreciated that the present invention might be utilized with any number of different components in a pressurized fluid system and should not be limited to the speciEic embodiments disclosed in this application. For example, the present invention might be used with hydraulic systems, con-tainers, valves, fluid lines, etc. The quick connect 7~
coupling has a body 26 including a cylindrical, exter-nally threaded first end 28 of lesser diameter than a solid first end 27 of the body 26. The externally threaded first end 28 defines a passage 29 extending axially into the body 26. An elastomeric seal 30, such as an O-ring, is positioned in a groove 32 of the coupling body 26 adjacent threads 34 of the threaded first end. Upon threading the coupling body 26 into the fluid port 22 the elastomeric seal 30 will abut an end 40 of the fluid port 22. A reciprocally axially slidable sleeve 42 is slidably mounted on a first cylindrical portion 44 of the coupling body 26 and a greater diameter second cylindrical portion 46 of the coupling body 26 for axially slidable movement between an unassisted seal position as illustrated in Figure l wherein the system pressure is not assisting in for-mation of the seal with the fluid port 26, and a pressure assisted seal position wherein an interior shoulder portion 48 of the sleeve 42 engages the elasto-meric seal 30 and forces the same against the end 40 ofthe fluid port 22 so as to assist in formation of the seal between the quick connect coupling 20 and the fluid port 22 as generally illustrated in Figure 2.
Additionally, in the embodiment shown, a first end 41 of the sleeve 42 is forced against the end 40 of the fluid port 22 so as to cooperate with the end 40 of the fluid port 22 to provide a mechanical barrier preventing extrusion of the seal 30 from between the end 40 of the fluid port 22 and the first end 41 of the sleeve 42.
The sleeve 42 includes an opposite second end 50 cooperating with a shoulder portion 52 of the coupling body 26 for maintaining the sleeve 42 on the coupling body 26. A cavity 54 is defined between the axially slidable sleeve 42 and the coupling body 26. ~ radially extending passage 56 interconnects the axially extending passage 29 to the cavity 54 for delivery of the fluid under pressure as indicated by the arrows 58 from the ~luid port 22 into the cavity 5~. Delivery o~ the fluid under pressure causes the sleeve 42 to move forward into engagement with the elastomeric seal 30. This is due to the fact that an unequal or "unbalancedl' force acting on the sleeve is caused by the sleeve 48 being a greater cross sectional area transverse to the axis of the coupling facing the end 26 of the coupling which is sub-jected to fluid pressure than tha~ ~acing the end 40 of the fluid port 22. In the embodiment shown, and as illustrated in Figu~e 6, this difference in cross sectional surface area is the difference in cross sectional surface area between a bore 47 of the sleeve 42 which slides on the cylindrical portion 46 and a bore 43 of the end 41 of sleeve 42 wherein the elasto-meric seal 30 is positioned. The net ~orce generated is P x dA where P represents fluid pressure and dA repre-sents the difference in cross sectional surface area.
An elastomeric seal 60 is retained in a groove 62 circumferentially about the coupling body 26 between shoulder portions 64 and 66. In systems having extre-mely high operating pressures, a cylindrical backup ring68 might be positioned between the elastomeric seal 60 and the shoulder portion 66 of the coupling body 26.
Under extremely high system fluid pressures, the ring 68 will expand and cooperate with the sleeve 42 to provide a barrier preventing extrusion oE the seal 60 between the sleeve 42 and the coupling body 26. The body 26 and the sleeve 42 might be made of metal. The backup ring 68 might be made of plastic or a Teflon'~ material.
In the specific embodiment oE the quick con-~Z~,''7'~
nect coupling shown, the cavity 54 circumferentially surrounding the coupling is formed by a diagonally extending surface 70 of the sleeve 42 and axially extending and radially extending surfaces 72,74 of the coupling body 26, although it might be formed in any number of different ways.
As illustrated in Figure 2, the fluid under pressure forces the sleeve 42 forward such that it enga-ges and deforms the elastomeric seal 30 and abuts against the end 40 of the fluid port 22.
Illustrated in Figures 3 and 4 is an embodi-ment of a connector in accordance with the principles of the present invention which provides for flowthrough of the fluid under pressure. In this embodiment, parts corresponding to those of the embodiment shown in Figures 1 and 2 are primed. As opposed to a solid end portion 27 of the coupling body 26, the coupling body 26' inGludes an internally threaded fitting 82 mounted in the coupling body 26' for swivel motion relative thereto and for interconnection to a fluid line (not shown) such as a hose or the like. In this embodiment, the coupling body 26' defines first and second bores 84,86 interconnected by a diagonal surface 88. The fitting 82 includes corresponding cylindrical portions 90 and 92 interconnected by a diagonal surface 94 which are configured for reception in the bores 84,86 of the cylindrical body 26'. A retaining ring 96 mounted in a groove 98 of the coupling body 26' engages a shoulder portion lQ0 of the fitting 82 for retaining the fitting 82 in the connector body 26'. An elastomeric seal 102 positioned in a groove 10~ of the fitting 82 between shoulder portions 106 and 108 provides a fluid tight seal between the fitting 82 and the cylindrical body 26'. In the embodiment shown, a backup ring 110 is pre-_9_ sant. The connector is illustrated in Figure 3 in anunassisted seal position, and in Figure 4 in a pressure assisted seal position, the sleeve 42' having been moved forward by the fluid pressure to engage the elastomeric seal 30' and about the end 40' of the fluid port 22'.
Illustrated in Figure 5, is yet another appli--cation o the present invention. In this embodiment, the principles of the present invention are utilized to provide a coupling extension ~aature so as to facilitate access to difficult to reach locations in the pressurized fluid system. In this embodiment, parts corresponding to those of Figures 1 and 2 are doubled primed. In this application, the coupling body 26'' includes a threaded bore portion 120 for receipt of a threaded extension member 122. In this e~bodiment, the extension member 122 might be mechanically wrenched into the coupling body 26'' and suitable sealants supplied to prevent lea~ge between t~e coupling body 26'' and the extension member 122. This embodiment is shown in the unassisted position; however, it will be appreciated that this embodiment functions in a similar fashion to that of the previous embodiments so as to provide a fluid pressure assisted sealing effect.
In use, the coupling body 26 is hand threaded into the fluid port 22 until the end 40 of the Eluid port 22 engages the elastomeric seal 30. As fluid is introduced under pressure into the coupling body 26, illustrated by the arrows 58, the sleeve 42 moves axially toward the elastomeric seal 30 due to the net or unbalanced orce caused by the pressure acting on the sleeve 42. Accordingly, sealing is accomplished without the use of any tools. The coupling can be readily disconnected upon removal of the fluid pressure.
It is to be understood that even though the 7'~3 above numerous characteristics and advantages of the invention have been set forth in the foregoing descrip-tion, together with details of the structure and func-tion of the invention, the disclosure is illustrative only, and changes may be made in detail, especially in matters of shape, size and arrangement of parts within the principles of the invention, to the full extent indicated by the broad, general meaning o the terms in which the appended claims are expressed.
J
Claims (9)
1. A quick connect coupling for fluid tight connection to a threaded fluid port, comprising:
(a) a coupling body, the coupling body having a cylindrical, externally threaded first end, the first end defining a passage extending axially into the coupling body from the first end;
(b) elastomeric sealing means circumferentially surrounding the first end of the coupling body for abutting an end of the fluid port upon threading the first end into the fluid port;
(c) external, axially slidable sleeve slidable between an unassisted seal position and a pressure assisted seal position, a first end of the sleeve including shoulder means for engaging the elastomeric seal means in the pressure assisted seal position, an opposite second end of the sleeve cooperating with retention means for retaining the sleeve on the coupling body; the axially slidable sleeve and the coupling body cooperating to define a cavity there between, passage means extending from the axially extending passage to the cavity for placing the cavity in fluid communication with the axially extending passage, the axially slidable sleeve and the coupling body further cooperating to cause an unbalanced force on the sleeve when subjected to fluid pressure, a resultant net force being axially directed on the sleeve in the direction of the fluid port, whereby entrance of fluid under pressure from the fluid port into the cavity forces the sleeve forward into engagement with the elastomeric seal means thereby forcing the elastomeric seal means against an end of the fluid port so as to form a fluid tight seal between the quick connector and the fluid port; and (e) secondary seal means proximate the second end of the sleeve for providing a fluid tight seal between the sleeve and the coupling body.
(a) a coupling body, the coupling body having a cylindrical, externally threaded first end, the first end defining a passage extending axially into the coupling body from the first end;
(b) elastomeric sealing means circumferentially surrounding the first end of the coupling body for abutting an end of the fluid port upon threading the first end into the fluid port;
(c) external, axially slidable sleeve slidable between an unassisted seal position and a pressure assisted seal position, a first end of the sleeve including shoulder means for engaging the elastomeric seal means in the pressure assisted seal position, an opposite second end of the sleeve cooperating with retention means for retaining the sleeve on the coupling body; the axially slidable sleeve and the coupling body cooperating to define a cavity there between, passage means extending from the axially extending passage to the cavity for placing the cavity in fluid communication with the axially extending passage, the axially slidable sleeve and the coupling body further cooperating to cause an unbalanced force on the sleeve when subjected to fluid pressure, a resultant net force being axially directed on the sleeve in the direction of the fluid port, whereby entrance of fluid under pressure from the fluid port into the cavity forces the sleeve forward into engagement with the elastomeric seal means thereby forcing the elastomeric seal means against an end of the fluid port so as to form a fluid tight seal between the quick connector and the fluid port; and (e) secondary seal means proximate the second end of the sleeve for providing a fluid tight seal between the sleeve and the coupling body.
2. A quick connect coupling in accordance with claim 1, wherein the end of the sleeve abuts the end of the fluid port in the pressure assisted seal position, thereby providing a barrier preventing extrusion of the elastomeric sealing means between the end of the fluid port and the sleeve when the quick connect coupling is used with extremely high fluid pressures.
3. A quick connect coupling in accordance with claim 1, wherein the secondary seal means includes an expandable flat cylindrical backup seal and an elastomeric seal, the backup seal cooperating with the sleeve and the coupling body to prevent extrusion of the elastomeric seal between the sleeve and the coupling body.
4. A quick connect coupling in accordance with claim 1, wherein the elastomeric sealing means includes an o-ring member.
5. A quick connect coupling in accordance with claim 1, wherein a second end of the coupling body is enclosed whereby the quick connect coupling can be used to plug a threaded fluid port.
6. A quick connect coupling in accordance with claim 1, wherein the axially extending passage of the coupling body extends completely through the coupling body to provide for linear flow through of fluid.
7. A quick connect coupling in accordance with claim 1, wherein a second end of the coupling body includes extension means for extending the overall length of the coupling, whereby the coupling can be used in hard to get at locations.
8. A quick connect coupling for fluid tight connection to a threaded fluid port, comprising:
(a) a coupling body, the coupling body having a cylindrical, externally threaded first end, the first end defining a passage extending axially into the coupling body from the first end;
(b) elastomeric sealing means circumferentially surrounding the first end of the coupling body for abutting an end of the fluid port upon threading the first end of the coupling body into the fluid port;
(c) a sleeve slidably mounted on and externally of the coupling body, the sleeve being capable of reciprocal movement between an unassisted sealed position and a pressure assisted seal position, a first end of the sleeve including shoulder means for engaging the elastomeric seal means in the pressure assisted seal position, an opposite second end of the sleeve cooperating with retention means for retaining the sleeve on the coupling body;
(d) a cavity being defined between the coupling body and the sleeve;
(e) passage means extending from the axially extending passage to the cavity for placing the cavity in fluid communication with the axially extending passa-geway;
(f) the sleeve including a surface partially defining the cavity which is subjected to the force of the fluid pressure so as to force the sleeve to the pressure assisted seal position; and (g) secondary seal means proximate the second end of the sleeve for providing a fluid tight seal between the sleeve and the coupling body.
(a) a coupling body, the coupling body having a cylindrical, externally threaded first end, the first end defining a passage extending axially into the coupling body from the first end;
(b) elastomeric sealing means circumferentially surrounding the first end of the coupling body for abutting an end of the fluid port upon threading the first end of the coupling body into the fluid port;
(c) a sleeve slidably mounted on and externally of the coupling body, the sleeve being capable of reciprocal movement between an unassisted sealed position and a pressure assisted seal position, a first end of the sleeve including shoulder means for engaging the elastomeric seal means in the pressure assisted seal position, an opposite second end of the sleeve cooperating with retention means for retaining the sleeve on the coupling body;
(d) a cavity being defined between the coupling body and the sleeve;
(e) passage means extending from the axially extending passage to the cavity for placing the cavity in fluid communication with the axially extending passa-geway;
(f) the sleeve including a surface partially defining the cavity which is subjected to the force of the fluid pressure so as to force the sleeve to the pressure assisted seal position; and (g) secondary seal means proximate the second end of the sleeve for providing a fluid tight seal between the sleeve and the coupling body.
9. A quick connect coupling for fluid tight connection to a threaded fluid port, comprising:
(a) a coupling body, the coupling body having an externally threaded first end and defining a passage extending axially into the coupling body from the first end;
(b) sealing means disposed proximate a first end of the coupling body;
(c) a sleeve externally mounted on the coupling body and slidable between an unassisted seal position and a pressure assisted seal position, the first end of the sleeve engaging the sealing means in the pressure assisted seal position and forcing the sealing means against an adjacent end of the fluid port to provide a fluid tight seal between the fluid port and the quick connect coupling;
(d) the axially slidable sleeve and the coupling body cooperating to define a cavity therebetween;
(e) passage means extending from the axially extending passage of the coupling body to the cavity for placing the cavity in fluid communication with the axially extending passage;
(f) the sleeve including a surface partially defining the cavity which is subjected to the pressure of the fluid; and (y) secondary seal means proximate the second end or the sleeve for providing a fluid tight seal between the sleeve and the coupling body.
(a) a coupling body, the coupling body having an externally threaded first end and defining a passage extending axially into the coupling body from the first end;
(b) sealing means disposed proximate a first end of the coupling body;
(c) a sleeve externally mounted on the coupling body and slidable between an unassisted seal position and a pressure assisted seal position, the first end of the sleeve engaging the sealing means in the pressure assisted seal position and forcing the sealing means against an adjacent end of the fluid port to provide a fluid tight seal between the fluid port and the quick connect coupling;
(d) the axially slidable sleeve and the coupling body cooperating to define a cavity therebetween;
(e) passage means extending from the axially extending passage of the coupling body to the cavity for placing the cavity in fluid communication with the axially extending passage;
(f) the sleeve including a surface partially defining the cavity which is subjected to the pressure of the fluid; and (y) secondary seal means proximate the second end or the sleeve for providing a fluid tight seal between the sleeve and the coupling body.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US872,119 | 1986-06-09 | ||
| US06/872,119 US4688830A (en) | 1986-06-09 | 1986-06-09 | Externally threaded quick connect coupling having integral fluid pressure assisted seal |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA1262748A true CA1262748A (en) | 1989-11-07 |
Family
ID=25358881
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA000537243A Expired CA1262748A (en) | 1986-06-09 | 1987-05-15 | Externally threaded quick connect coupling having integral fluid pressure assisted seal |
Country Status (7)
| Country | Link |
|---|---|
| US (1) | US4688830A (en) |
| EP (1) | EP0269726A4 (en) |
| JP (1) | JPH01500453A (en) |
| CN (1) | CN87104182A (en) |
| AU (1) | AU7645987A (en) |
| CA (1) | CA1262748A (en) |
| WO (1) | WO1987007698A1 (en) |
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| US4884830A (en) * | 1988-01-19 | 1989-12-05 | Fastest, Inc. | Quick connect coupling device |
| JPH073985B2 (en) * | 1988-10-14 | 1995-01-18 | 橋本コーポレイション株式会社 | Answering machine with videophone |
| US4920626A (en) * | 1989-04-07 | 1990-05-01 | Precision General, Inc. | Stabilized connector flange for interconnecting an instrument manifold with an orifice plate assembly |
| US4974308A (en) * | 1989-04-07 | 1990-12-04 | Precision General, Inc. | Method for interconnecting an instrument manifold with an orifice plate assembly |
| US5009455A (en) * | 1989-12-05 | 1991-04-23 | Irvine Bruce W | seal |
| US5242198A (en) * | 1992-02-26 | 1993-09-07 | Imodco, Inc. | Fluid swivel seal arrangement |
| US5332233A (en) * | 1992-11-19 | 1994-07-26 | Alliedsignal Inc. | Face seal means |
| GB2293429A (en) * | 1994-09-23 | 1996-03-27 | Gordon Lou Rose | Pipe plug |
| US5788290A (en) * | 1995-12-27 | 1998-08-04 | Fastest, Inc. | Quick connect coupler |
| US5950679A (en) * | 1998-02-10 | 1999-09-14 | Fastest, Inc. | High pressure plug coupling |
| US7163028B1 (en) * | 2004-05-26 | 2007-01-16 | Manuel Diaz Atkinson | Multipurpose plumbing tool |
| US7575024B2 (en) | 2005-11-05 | 2009-08-18 | Snap-Tite Technologies, Inc. | Threaded coupling with flow shutoff |
| US7762279B2 (en) | 2005-11-05 | 2010-07-27 | Snap-Tite Technologies, Inc. | Threaded coupling with flow shutoff |
| US7478838B2 (en) * | 2006-01-27 | 2009-01-20 | Cincinnati Test Systems, Inc. | Quick-connect fitting |
| US7591484B2 (en) | 2006-01-27 | 2009-09-22 | Cincinnati Test Systems, Inc. | Quick-connect fitting |
| US8056581B2 (en) * | 2006-04-06 | 2011-11-15 | Fastest, Inc. | Latching connectors |
| US20080114308A1 (en) * | 2006-11-13 | 2008-05-15 | Di Palma Giorgio | Vascular Access Port with Catheter Connector |
| US7793914B2 (en) * | 2007-02-06 | 2010-09-14 | Fastest, Inc. | Quick connect connector with tolerance accommodation |
| US20090014243A1 (en) * | 2007-07-13 | 2009-01-15 | Petrolink Usa, Llc | Breather-sampling-filler assembly for liquid reservoirs/systems |
| EP2329177A4 (en) * | 2008-08-27 | 2014-07-09 | Elkhart Brass Mfg Co | Quick connect coupler |
| FR2941027B1 (en) * | 2009-01-13 | 2011-03-04 | Legris Sa | ELEMENT OF A FLUID TRANSPORT CIRCUIT WITH A MOBILE SEALING SEAL |
| US20120085453A1 (en) * | 2009-06-17 | 2012-04-12 | Francis Desmond Lourigan | End plug |
| EP2464904B1 (en) * | 2009-08-10 | 2013-05-29 | Parker-Hannificn Corporation | Pressure protection valve |
| US8696035B2 (en) * | 2010-10-27 | 2014-04-15 | Bha Altair, Llc | Venturi adapter |
| US9108644B2 (en) | 2012-10-26 | 2015-08-18 | Electro-Motive Diesel, Inc. | Fuel pressure actuated coupling for train consist |
| US9951898B2 (en) * | 2014-05-06 | 2018-04-24 | Benjamin V Booher, Sr. | Anti-tangling coupling device |
| GB2532040B (en) * | 2014-11-06 | 2020-03-25 | Kee Connections Ltd | A pressurised fluid coupling |
| WO2017033203A2 (en) * | 2015-08-25 | 2017-03-02 | Kumar Gupta Swadesh | An adjustable length pipe connector for connecting to a pipe connection |
| EP3026318B1 (en) * | 2015-12-23 | 2018-02-14 | TI Automotive (Fuldabrück) GmbH | Connector with mounting aid and method for producing a connector |
| US10221985B2 (en) * | 2016-03-31 | 2019-03-05 | Benjamin H. Ramirez | Pipe cap with transition fitting |
| US10718455B2 (en) | 2016-08-02 | 2020-07-21 | Fastest, Inc. | Internal thread grip fluid connector |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US23137A (en) * | 1859-03-01 | Albert a | ||
| US418225A (en) * | 1889-12-31 | Lewis j | ||
| FR637436A (en) * | 1926-07-03 | 1928-04-30 | Ammonia Casale Sa | Removable closure to obtain continuous fluid tightness |
| US1896062A (en) * | 1931-05-29 | 1933-02-07 | Beloit Iron Works | Self-balancing steam fitting |
| US2485976A (en) * | 1946-03-08 | 1949-10-25 | Aeroquip Corp | Hydraulic connector |
| US2494598A (en) * | 1947-06-16 | 1950-01-17 | Alfred C Waring | Hydraulic packing and seal |
| US2712458A (en) * | 1950-06-05 | 1955-07-05 | Lipson Leonard | Pipe couplings |
| US2703720A (en) * | 1950-08-17 | 1955-03-08 | Chiksan Co | Swiveled well head with sealing means |
| US2689754A (en) * | 1950-11-03 | 1954-09-21 | Thomas C Wilson Inc | Safety coupling |
| DE883689C (en) * | 1951-10-24 | 1953-07-20 | Guenter Scholz | Device for sealing the lids of pressure vessels |
| US2819733A (en) * | 1956-05-15 | 1958-01-14 | Maisch Oliver | Tube sealer and connector |
| DE1094055B (en) * | 1959-01-08 | 1960-12-01 | Hans Kreidel Jun | Direction-adjustable and lockable screw-in high pressure pipe connection |
| FR1253297A (en) * | 1959-12-29 | 1961-02-10 | Cie Des Raccords Et Robinets | Swivel connector |
| US3291442A (en) * | 1964-07-27 | 1966-12-13 | Stile Craft Mfg Inc | Gas or vacuum-operated couplings |
| US3377028A (en) * | 1966-04-05 | 1968-04-09 | L & A Products Inc | Self-sealing connector for multiaperture nozzle |
| DE1947306B2 (en) * | 1969-09-18 | 1972-04-20 | Schnabel, Ernst, Dr., 6250 Limburg | CONNECTION OF TWO METAL PARTS CLADED OR CLADED WITH PLASTIC |
| US3727952A (en) * | 1971-04-19 | 1973-04-17 | Tuthill Pump Co | Tube connector |
| US3724879A (en) * | 1971-11-22 | 1973-04-03 | C Snyder | Tubing coupling |
| US3841670A (en) * | 1972-07-07 | 1974-10-15 | Lucas Industries Ltd | Apparatus for connecting pipes to an aircraft engine |
| US4042020A (en) * | 1976-02-23 | 1977-08-16 | William Wellstein | Positive seal pitless well adapter |
| US4129145A (en) * | 1977-05-26 | 1978-12-12 | Wynn James M | Check valve assembly |
| SE423439B (en) * | 1979-04-25 | 1982-05-03 | Nolek System Ab | QUICK CONNECTOR FOR PRESSURE MEDIUM CONNECTING WITH A REVERSE RORNIPEL E D |
| US4261601A (en) * | 1979-09-06 | 1981-04-14 | Sloan Albert H | Jetting adapter for well point pumping apparatus |
| US4345783A (en) * | 1980-06-09 | 1982-08-24 | Bergstrand Gunnar M | Pipe coupling device |
| SE424908B (en) * | 1980-12-22 | 1982-08-16 | Nolek System Ab | QUICK COUPLING DEVICE FOR THE PRESSURE MEDIUM, IN PARTICULAR TEMPORARY COUPLING WITH A PIPE END |
| DE3247784C1 (en) * | 1982-12-23 | 1984-06-14 | Weh, Erwin, 7918 Illertissen | Plug-in coupling for the pressure-tight connection of a pressure line with a pressure-operated device |
| US4589689A (en) * | 1984-04-16 | 1986-05-20 | Hughes Tool Company | Energized seal for upper termination |
-
1986
- 1986-06-09 US US06/872,119 patent/US4688830A/en not_active Expired - Lifetime
-
1987
- 1987-05-15 CA CA000537243A patent/CA1262748A/en not_active Expired
- 1987-05-29 AU AU76459/87A patent/AU7645987A/en not_active Abandoned
- 1987-05-29 EP EP19870904424 patent/EP0269726A4/en not_active Withdrawn
- 1987-05-29 JP JP62504074A patent/JPH01500453A/en active Pending
- 1987-05-29 WO PCT/US1987/001256 patent/WO1987007698A1/en not_active Application Discontinuation
- 1987-06-09 CN CN87104182A patent/CN87104182A/en active Pending
Also Published As
| Publication number | Publication date |
|---|---|
| EP0269726A4 (en) | 1988-09-28 |
| EP0269726A1 (en) | 1988-06-08 |
| JPH01500453A (en) | 1989-02-16 |
| US4688830A (en) | 1987-08-25 |
| CN87104182A (en) | 1987-12-23 |
| WO1987007698A1 (en) | 1987-12-17 |
| AU7645987A (en) | 1988-01-11 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| MKEX | Expiry |